Bad o2 sensors cause of turbo issue?

**snowplow** · 03-21-2010 12:45 PM

my two front o2 sensors are trashed they have been throwing codes for a very long time, my MPG is acting weird, im trying to think what could be making my turbo scream like it is and make my car not pull like i was. also i found out the ECU i bought was for a triptronic would that make a difference also? is there anything i can do to figure this out? i tried recording the sound of the turbo but couldnt due to poor quality of my camcorder, also i have some back fire when i rev up and the rpms start to fall i have some popping not too loud, really need some one local and qualified to help a fellow AZ guy out. please PM me if your in the philadelphia area!!!

**KNaudi** · 03-21-2010 12:56 PM

why haven't you replaced the 02s that control your fuel/air mix? of course you are going to have weird mileage (by weird, I'm guessing you mean terrible)

**NOTORIOUS VR** · 03-21-2010 01:10 PM

Originally Posted by snowplow

my two front o2 sensors are trashed they have been throwing codes for a very long time, my MPG is acting weird, im trying to think what could be making my turbo scream like it is and make my car not pull like i was. also i found out the ECU i bought was for a triptronic would that make a difference also? is there anything i can do to figure this out? i tried recording the sound of the turbo but couldnt due to poor quality of my camcorder, also i have some back fire when i rev up and the rpms start to fall i have some popping not too loud, really need some one local and qualified to help a fellow AZ guy out. please PM me if your in the philadelphia area!!!

Sounds like it's finally time to reach into your pockets.... neglect is the last thing you want to do with the B5 S4.

Buy a VAG-COm cable, pull codes and post, change the O2's, pull the plugs and inspect/change, pressure test and inspect the charge system.... That's the minimum.

**lbs4** · 03-21-2010 01:13 PM

the screaming your talking about is probably your turbos going. id stay out of boost until you get new ones

**snowplow** · 03-21-2010 02:05 PM

Originally Posted by lbs4

the screaming your talking about is probably your turbos going. id stay out of boost until you get new ones

i just put ko4 in 500 miles ago

**drkenan** · 03-21-2010 02:21 PM

Dude, PLEASE tell me you've pressure tested?!? A bunch of people took the time to give you advice in your last thread. Do it...it takes 10 min to build a tester.

**snowplow** · 03-21-2010 02:35 PM

Originally Posted by drkenan

Dude, PLEASE tell me you've pressure tested?!? A bunch of people took the time to give you advice in your last thread. Do it...it takes 10 min to build a tester.

ill do it now, how do i build one?

**snowplow** · 03-21-2010 02:36 PM

Originally Posted by drkenan

Dude, PLEASE tell me you've pressure tested?!? A bunch of people took the time to give you advice in your last thread. Do it...it takes 10 min to build a tester.

id do it right now if i knew how to build it